MPH to KM/H Converter
Miles per hour to kilometers per hour, m/s, knots, and ft/s. Speed limits, top speeds, windspeed.
Quick trick: double mph and add 10% to get approximate km/h. 70 mph × 2 = 140, +10% = ~154. Actual: 112.65 km/h. OK, don't use that trick. Use the converter.
| Unit | Value |
|---|---|
| mph | 70 mph |
| km/h | 112.654 km/h |
| m/s | 31.293 m/s |
| knots | 60.828 knots |
| ft/s | 102.667 ft/s |
About this calc
Convert speed between miles per hour, kilometers per hour, meters per second, knots, and feet per second. Works for speed limits, top speeds, wind speeds, and nautical/aviation applications.
FAQ
- How do I convert mph to km/h?
- Multiply mph by 1.609344. 70 mph × 1.609344 ≈ 112.65 km/h.
- What's 100 km/h in mph?
- 100 km/h ≈ 62.14 mph. The '100 km/h is open road' in much of Europe is roughly 62 mph.
- What's a knot vs mph?
- 1 knot = 1.15078 mph. Knots are nautical miles per hour — used in aviation and sailing because they map cleanly to latitude/longitude.
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